There is potable water available at the ranger stations at both Snug Harbor and Windigo and their neighboring campgrounds of Rock Harbor and Washington Creek. All campgrounds have a natural water supply on-site or nearby, but these sources should be presumed infected with parasites, and either filtered or thoroughly boiled before drinking or cooking. Filters are the best option for drinking water, because that retains its refreshing coldness, and is also most practical for the gallon/day or more each person is likely to need. Chemical purification tablets won't kill the tapeworm eggs that the moose deposit in the water supply.
Soft drinks are sold at both camp stores. The Greenstone Grill see "Eat" also serves a small assortment of mainstream U.S. and Canadian beers including Moosehead, and a small but well-chosen selection of Michigan microbrews. Bring your own liquor to the island if you wish, but keep in mind that drunken campers disturb both wildlife and other campers, and alcohol is prohibited at a few campgrounds. Besides, the last thing you need in the wilderness is impaired judgment, dehydration, a hangover, and a bottle to carry.
